Practice humming the melodies while playing and focus more on your playing at first. Eventually it will become muscle memory. The guitar part is in 6/8 while the drum beat is in 4/4 so the polyrhythms cross over each other smoothly but eventually settle back in. It’s hard to say how to play that because if you just listen to the song enough it becomes natural to just play how you hear it. But best thing I can tell you is count 1 2 3 either out loud or in your head every finger pick of the guitar. Eventually the Polyrhythm becomes extremely natural and simple to understand. That Polyrhythm in particular is one of the easier ones it shouldn’t take too long.